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org.apache.poi.poifs.filesystem</FONT>
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Class BlockStore</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.poi.poifs.filesystem.BlockStore</B>
</PRE>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/poi/poifs/filesystem/NPOIFSFileSystem.html" title="class in org.apache.poi.poifs.filesystem">NPOIFSFileSystem</A>, <A HREF="../../../../../org/apache/poi/poifs/filesystem/NPOIFSMiniStore.html" title="class in org.apache.poi.poifs.filesystem">NPOIFSMiniStore</A></DD>
</DL>
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<DT><PRE>public abstract class <B>BlockStore</B><DT>extends java.lang.Object</DL>
</PRE>

<P>
This abstract class describes a way to read, store, chain
  and free a series of blocks (be they Big or Small ones)
<P>

<P>
<HR>

<P>
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<CODE>protected &nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.ChainLoopDetector.html" title="class in org.apache.poi.poifs.filesystem">BlockStore.ChainLoopDetector</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Used to detect if a chain has a loop in it, so
  we can bail out with an error rather than
  spinning away for ever...</TD>
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<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#BlockStore()">BlockStore</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>protected abstract &nbsp;java.nio.ByteBuffer</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#createBlockIfNeeded(int)">createBlockIfNeeded</A></B>(int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Extends the file if required to hold blocks up to
  the specified offset, and return the block from there.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;<A HREF="../../../../../org/apache/poi/poifs/storage/BATBlock.BATBlockAndIndex.html" title="class in org.apache.poi.poifs.storage">BATBlock.BATBlockAndIndex</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getBATBlockAndIndex(int)">getBATBlockAndIndex</A></B>(int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the BATBlock that handles the specified offset,
  and the relative index within it</TD>
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<CODE>protected abstract &nbsp;java.nio.ByteBuffer</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getBlockAt(int)">getBlockAt</A></B>(int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Load the block at the given offset.</TD>
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<CODE>protected abstract &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getBlockStoreBlockSize()">getBlockStoreBlockSize</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the size of the blocks managed through the block store.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;<A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.ChainLoopDetector.html" title="class in org.apache.poi.poifs.filesystem">BlockStore.ChainLoopDetector</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getChainLoopDetector()">getChainLoopDetector</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a Detector for loops in the chain</TD>
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<CODE>protected abstract &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getFreeBlock()">getFreeBlock</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finds a free block, and returns its offset.</TD>
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<CODE>protected abstract &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#getNextBlock(int)">getNextBlock</A></B>(int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Works out what block follows the specified one.</TD>
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<CODE>protected abstract &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.html#setNextBlock(int, int)">setNextBlock</A></B>(int&nbsp;offset,
             int&nbsp;nextBlock)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes the record of what block follows the specified one.</TD>
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<A NAME="BlockStore()"><!-- --></A><H3>
BlockStore</H3>
<PRE>
public <B>BlockStore</B>()</PRE>
<DL>
</DL>

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<A NAME="getBlockStoreBlockSize()"><!-- --></A><H3>
getBlockStoreBlockSize</H3>
<PRE>
protected abstract int <B>getBlockStoreBlockSize</B>()</PRE>
<DL>
<DD>Returns the size of the blocks managed through the block store.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getBlockAt(int)"><!-- --></A><H3>
getBlockAt</H3>
<PRE>
protected abstract java.nio.ByteBuffer <B>getBlockAt</B>(int&nbsp;offset)
                                           throws java.io.IOException</PRE>
<DL>
<DD>Load the block at the given offset.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="createBlockIfNeeded(int)"><!-- --></A><H3>
createBlockIfNeeded</H3>
<PRE>
protected abstract java.nio.ByteBuffer <B>createBlockIfNeeded</B>(int&nbsp;offset)
                                                    throws java.io.IOException</PRE>
<DL>
<DD>Extends the file if required to hold blocks up to
  the specified offset, and return the block from there.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getBATBlockAndIndex(int)"><!-- --></A><H3>
getBATBlockAndIndex</H3>
<PRE>
protected abstract <A HREF="../../../../../org/apache/poi/poifs/storage/BATBlock.BATBlockAndIndex.html" title="class in org.apache.poi.poifs.storage">BATBlock.BATBlockAndIndex</A> <B>getBATBlockAndIndex</B>(int&nbsp;offset)</PRE>
<DL>
<DD>Returns the BATBlock that handles the specified offset,
  and the relative index within it
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getNextBlock(int)"><!-- --></A><H3>
getNextBlock</H3>
<PRE>
protected abstract int <B>getNextBlock</B>(int&nbsp;offset)</PRE>
<DL>
<DD>Works out what block follows the specified one.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setNextBlock(int, int)"><!-- --></A><H3>
setNextBlock</H3>
<PRE>
protected abstract void <B>setNextBlock</B>(int&nbsp;offset,
                                     int&nbsp;nextBlock)</PRE>
<DL>
<DD>Changes the record of what block follows the specified one.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getFreeBlock()"><!-- --></A><H3>
getFreeBlock</H3>
<PRE>
protected abstract int <B>getFreeBlock</B>()
                             throws java.io.IOException</PRE>
<DL>
<DD>Finds a free block, and returns its offset.
 This method will extend the file/stream if needed, and if doing
  so, allocate new FAT blocks to address the extra space.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getChainLoopDetector()"><!-- --></A><H3>
getChainLoopDetector</H3>
<PRE>
protected abstract <A HREF="../../../../../org/apache/poi/poifs/filesystem/BlockStore.ChainLoopDetector.html" title="class in org.apache.poi.poifs.filesystem">BlockStore.ChainLoopDetector</A> <B>getChainLoopDetector</B>()
                                                              throws java.io.IOException</PRE>
<DL>
<DD>Creates a Detector for loops in the chain
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
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